Language is power. Cellphones ‘possibly’ are carcinogenic, under the lowest possible 2b possibility. This has turned into ‘Cellphones are carcinogenic.’
As Phil Plait points out, here are some other things that are ‘possibly carcinogenic’ under the same rating:
You may also wish to note what other things are categorized as Group 2B possible carcinogens, including gasoline, pickled vegetables, and (GASP!) coffee.
Also, any grilled food falls under that category as well.